Zynq Reset

Question

Dear all,

i want to reset the zynq. the code that is used for this purpose according to TRM document is

Xil_Out32(XPS_SYS_CTRL_BASEADDR + 0x00000200,0x00000001);

but nothing happened.

please help me where is wrong, should i do something before this code?

sincerely yours.

zedhed · Accepted Answer

Hi zara,

Take a look at UG585 where this information is taken from:

http://www.xilinx.com/support/documentation/user_guides/ug585-Zynq-7000-TRM.pdf

Access to XPS_SYS_CTRL_BASEADDR address space is not allowed since the system controller memory space is protected from accidental modification. If you look at page 1581 of the Zynq Technical Reference Manual, which covers the 0xF8000000 SLCR space, you can see that SLCR_LOCK register description shows the following text for the LOCK_KEY bits [15:0]:

"Write the lock key, 0x767B, to write protect the slcr
registers: all slcr registers, 0xF800_0000 to
0xF800_0B74, are write protected until the unlock
key is written to the SLCR_UNLOCK register. A
read of this register returns zero."

Likewise the SLCR_UNLOCK register description shows the following text for the UNLOCK_KEY bits [15:0]:

"Write the unlock key, 0xDF0D, to enable writes to
the slcr registers. All slcr registers, 0xF800_0000 to
0xF800_0B74, are writeable until locked using the
SLCR_LOCK register. A read of this register
returns zero."

Try following this information to unlock access to the register before writing to it and see if this works for you.

Regards,

-Kevin